Cylinder head

Ref.

Part Number

DescriptionPerYearModel

NI

GS339

Gasket Set11972-73All B50

NI

PACK-ADV-002

Valve & guide packAAll 

NI

PACK-INTER-002

Top end overhaul packAAllAll

NI

PACK-START-005

Exhaust packAAllAll

1

02-0443

Nut – valve Lifter (1/4 B.S.C.)11971-73B50 T SS H

2

02-0525

Plain washer, valve lifter, inner11971-73All B50

3

15-5155

Plain washer, valve lifter, outer11971-73All B50

4

40-0417

Exhaust valve lifter Spindle11971-73All B50

5

14-0402

Nut- rocker box, beneath head steady bracket21972-73All B50

5

14-0302

Nut, rocker box71971-73All B50

6

60-2428

Spring washer, rocker box91971-73All B50

7

60-2330

Washer (5/16 x 5/8 x 1/16)91971-73All B50

8

71-1429

Gasket – rocker inspection cover11971-73All B50

9

40-0208

Rocker inspection cover11971-73All B50

10

71-1627

Exhaust valve glide, oversize available +0.01211971-73All B50

11

40-0309

Screw – rocker inspection cover (2 B.A. x 1 3/8)11971-73All B50

12

71-1736

Exhaust valve11971-73All B50

13

21-2135

Stud -cylinder head (5/16 UN.C./UN,F. x 3 1/16 )31972-73All B50

14

71-3148

Low level pipe11971-73B50 H

14

71-2899

Exhaust pipe complete11972B50 MX

14

71-2177

Exhaust pipe complete11971-72All B50

14

71-3801

Exhaust pipe, complete with bracket11973B50 MX

15

71-1732

Cylinder head with fixed fittings11971-73All B50

16

14-1302

Nut, carb fixing2

17

71-2592

Insulating washer -carburetter joint11971-73B50 MX

17

70-7821

Insulating washer – carburetter joint11971-72All B50

18

71-2593

Gasket -carburetter joint11971-73B50 MX

18

71-1421

Carburetter joint gasket11971-72All B50

19

14-1619

Stud (5/16 UN.C./UN.F. X 1 1/4 )21972-73All B50

20

71-1735

Inlet valve11971-73All B50

21

68-0931

Valve spring bottom cup11971-73All B50

22

71-1626

Inlet valve guide11971-73All B50

23

65-2494

Valve spring outer supplied as a complete Set21971-73All B50

24

65-2495

Valve spring inner supplied as a complete Set21971-73All B50

25

71-1165

Valve spring top collar21971-73All B50

26

71-1166

Valve spring collet41971-73All B50

27

21-2133

Stud –cylinder head (5/16 UN.F./UN.C. 2 9/16 ) 21972-73All B50

28

71-1989

Cylinder head dowel21971-73All B50

29

14-1627

Cylinder head stud (5/16 UN.C./UN.F. X 3)21971B50

29

21-2134

Stud -cylinder head (5/16 UN.C./UN.F. X 2 13/16 )21972-73All B50

30

21-2092

Rocker box stud (5/16 UN.C./UN.F. X 3 1/4)21971-73All B50

31

71-1623

Rocker box gasket11971-73All B50

32

71-1638

Rocker box11971-72All B50

32

71-3255

Rockerbox11973B50 MX

33

40-0969

Washer – valve inspection cap 21971-72All B50

33

97-3765

‘O’ ring -valve inspection cap”21973B50 MX

34

40-0968

Valve inspection cap 21971-73All B50

35

68-0289

‘O’ ring – valve lifter spindle11971-73B50 T SS H

36

71-2938

Exhaust valve lifter lever11971B50 T SS H

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